In a closed container two reactions take place simultaneously

$\text{ (i) }{\mathrm{PCl}}_5\left(\mathrm{g}\right)\rightleftharpoons {\mathrm{PCl}}_3\left(\mathrm{g}\right)+{\mathrm{Cl}}_2\left(\mathrm{g}\right)$ and

$\text{ (ii) }\mathrm{CO}\left(\mathrm{g}\right)+{\mathrm{Cl}}_2\left(\mathrm{g}\right)\rightleftharpoons {\mathrm{COCl}}_2\left(\mathrm{g}\right)$

On adding more $\mathrm{CO}$into the container, select the correct options :

(P) Degree of dissociation of ${\mathrm{PCl}}_5\left(\mathrm{g}\right)$decrease 

Q) Cone. of $\mathrm{CO}\left(\mathrm{g}\right)$ at new equilibrium position i less than that of at initial equilibrium cone.

(R) Degree of dissociation of ${\mathrm{PCl}}_5\left(\mathrm{g}\right)$ increases.